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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2008-07-21 21:18:20 -0300
committerJohn W. Linville <linville@tuxdriver.com>2008-07-29 16:36:35 -0400
commit064af1117b4aa64a0e52f6b741df7356ef055142 (patch)
tree262651d81f5d390467ee80bca96e403f86bacee3 /net
parentf1b23361a0f15497d4c6795a2935b2e98064ddfb (diff)
rfkill: mutex fixes
There are two mutexes in rfkill: rfkill->mutex, which protects some of the fields of a rfkill struct, and is also used for callback serialization. rfkill_mutex, which protects the global state, the list of registered rfkill structs and rfkill->claim. Make sure to use the correct mutex, and to not miss locking rfkill->mutex even when we already took rfkill_mutex. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Acked-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
-rw-r--r--net/rfkill/rfkill.c29
1 files changed, 19 insertions, 10 deletions
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
index fc3a4fd88995..ac205eceaf42 100644
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -150,7 +150,7 @@ static void update_rfkill_state(struct rfkill *rfkill)
* even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to
* give the driver a hint that it should double-BLOCK the transmitter.
*
- * Caller must have aquired rfkill_mutex.
+ * Caller must have acquired rfkill->mutex.
*/
static int rfkill_toggle_radio(struct rfkill *rfkill,
enum rfkill_state state,
@@ -216,8 +216,11 @@ void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
rfkill_states[type] = state;
list_for_each_entry(rfkill, &rfkill_list, node) {
- if ((!rfkill->user_claim) && (rfkill->type == type))
+ if ((!rfkill->user_claim) && (rfkill->type == type)) {
+ mutex_lock(&rfkill->mutex);
rfkill_toggle_radio(rfkill, state, 0);
+ mutex_unlock(&rfkill->mutex);
+ }
}
mutex_unlock(&rfkill_mutex);
@@ -228,7 +231,7 @@ EXPORT_SYMBOL(rfkill_switch_all);
* rfkill_epo - emergency power off all transmitters
*
* This kicks all rfkill devices to RFKILL_STATE_SOFT_BLOCKED, ignoring
- * everything in its path but rfkill_mutex.
+ * everything in its path but rfkill_mutex and rfkill->mutex.
*/
void rfkill_epo(void)
{
@@ -236,7 +239,9 @@ void rfkill_epo(void)
mutex_lock(&rfkill_mutex);
list_for_each_entry(rfkill, &rfkill_list, node) {
+ mutex_lock(&rfkill->mutex);
rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
+ mutex_unlock(&rfkill->mutex);
}
mutex_unlock(&rfkill_mutex);
}
@@ -372,6 +377,9 @@ static ssize_t rfkill_claim_store(struct device *dev,
if (!capable(CAP_NET_ADMIN))
return -EPERM;
+ if (rfkill->user_claim_unsupported)
+ return -EOPNOTSUPP;
+
/*
* Take the global lock to make sure the kernel is not in
* the middle of rfkill_switch_all
@@ -380,19 +388,17 @@ static ssize_t rfkill_claim_store(struct device *dev,
if (error)
return error;
- if (rfkill->user_claim_unsupported) {
- error = -EOPNOTSUPP;
- goto out_unlock;
- }
if (rfkill->user_claim != claim) {
- if (!claim)
+ if (!claim) {
+ mutex_lock(&rfkill->mutex);
rfkill_toggle_radio(rfkill,
rfkill_states[rfkill->type],
0);
+ mutex_unlock(&rfkill->mutex);
+ }
rfkill->user_claim = claim;
}
-out_unlock:
mutex_unlock(&rfkill_mutex);
return error ? error : count;
@@ -521,8 +527,11 @@ static void rfkill_remove_switch(struct rfkill *rfkill)
{
mutex_lock(&rfkill_mutex);
list_del_init(&rfkill->node);
- rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
mutex_unlock(&rfkill_mutex);
+
+ mutex_lock(&rfkill->mutex);
+ rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
+ mutex_unlock(&rfkill->mutex);
}
/**